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\subsection*{实验2.自准直法测凸透镜焦距}

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\begin{tabular}{|c|c|c|c|}
\hline 
光源/mm &  凸透镜1/mm & 凸透镜2/mm & 均值/mm \\ 
\hline 
{%for ei in EXPER -%}
{% for i in ei-%}
{% if loop.index ==1 -%}
%% i %%
{% else -%}
& %% i %%
{%- endif %}
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\\
\hline

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$\because f = {x}_{\text{光源}} - {x}_{\text{凸}} - \delta$		$\delta = $ %% DELTA %% mm\\
$\therefore {f}_1 = $%% F[0] %% mm    
${f}_2 = $%% F[1] %% mm    
${f}_3 = $%% F[2] %% mm    
${f}_4 = $%% F[3] %% mm    
${f}_5 = $%% F[4] %% mm

$\therefore \bar{f} = \frac{{f}_1+{f}_2+{f}_3+{f}_4+{f}_5}{5}$ = %%　AVERAGE_F %% mm\\
不确定度计算： A类 ${u}_a = \sqrt{\frac{\bar{x^{2}} + \bar{x} ^{2}}{k-1}}$ %% UA_F %% mm\\
             B类 ${u}_b = \frac{0.5}{\sqrt{3}} = $ %% UB_F %% mm\\
             $u(f) = \sqrt{{u}_a ^ {2} + {u}_b ^ {2}} = $ %% UF %% mm\\
             $\therefore $最终结果 f = (%% FINAL_F %% 
             $\pm $ %% FINAL_U %% 
             ) mm
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